Bubble Bags to Make Hash: Ice Water, Micron Sizes and Quality Tips
October 16, 2025
by Canna City
5 minutes
This page was last updated on October 12, 2026
The bubble bag method of creating solventless hash has revolutionised how we use hash. Bubble Bags are bags fitted with different micron screens that allow trichomes to be separated from plant matter using agitation in ice water. The process is simple, sanitary, and uses no chemicals or solvents. Each bag collects different sizes of trichome heads, allowing for varying grades of the final hash produced.
Because trichomes become brittle at low temperatures, they break off from the plant easily when agitated lightly. The material is then filtered by particle size, collecting mainly resin heads and less chopped leaf material. That is why multiple screens and filters are used in most water-hash setups.
For those new to extracting, a 4-bag set (220, 160, 73 and 25 micron) is recommended. More advanced extractors usually prefer an 8-bag setup for finer separation.
Generally speaking, the top-quality “full melt” hash comes from the 73 micron bag, while lower and higher micron bags yield “food-grade” hash (for edibles or rosin).
Typically, both water hash and rosin are considered the two main paths for solventless concentrates.
Selecting your best bubble bag setup
| Micron size | Function | Hash grade |
| 220μ | Work bag — plant material is removed | No hash collected |
| 190μ | Primary filtration | Poor grade |
| 160μ | Secondary filtration | Mediocre grade |
| 120μ | Premium collection | Higher grade |
| 90μ | Clean trichome heads with good melt potential | Top-shelf grade |
| 73μ | Top-shelf trichome heads | Top-shelf grade |
| 45μ | Finest heads | Excellent grade |
| 25μ | Smallest particles | Above-average grade |
Tips for making great water hash
Preparation before extraction:
- Freeze the raw product for at least 24 hours. Freezing makes the trichomes brittle, which helps them break away from the rest of the plant.
- Have plenty of ice available — as cold as possible.
- Extract in a cool area to reduce heat during the extraction process.
- Buy a decent initial work bag (220 micron) as your first line of defence.
Water hash extraction steps:
- Prepare each bag in order of micron size, starting with the smallest and moving to the largest.
- Add ice, product and water to the bucket in a 3:1:1 ratio.
- Gently agitate for 15–20 minutes. Agitation that is too vigorous causes chlorophyll to be released.
- Allow the product to settle for 10 minutes, then drain off the liquid.
- Carefully collect hash from each bag.
Checklist for good quality water hash:
- Quality of starting material: fresh flowers containing high amounts of resin tend to create cleaner and better-tasting water hash than older dried material.
- Reducing contamination: green colouration and “harshness” indicate that excessive plant material has passed through the filters.
- Drying: proper drying is essential. Poor drying affects flavour, stability and, in extreme cases, can cause health concerns.
Things to watch out for when making water hash
- Don’t rush drying. Mould develops if the hash remains moist.
- Dry slowly by spreading it out on parchment paper or placing it in a freeze dryer.
- Five to seven days in a well-ventilated space, away from direct sunlight and at room temperature, is the normal time required for proper drying.
- Gentle agitation helps preserve fragile trichomes and prevent contamination.
- Several short wash cycles may be preferable to one long wash.
Signs of good quality hash from Bubble Bags:
When fully melted with heat (full melt), bubble bag hash should be light blond or golden in colour. A pleasing odour is another indicator. If the hash begins to turn green, the material may have been agitated too aggressively or the water may have become too warm. Reduce agitation and keep the mixture colder during the next wash. If the hash remains wet or clumpy after several days, it may not be fully dry and will need additional drying time.Why does full melt matter in water hash?
Flavour alone doesn’t determine water hash quality. Melting characteristics play a significant role. That’s why full melt has become one of the ways we judge products, with star ratings (e.g. 5* to 6*) implying that nearly all trichomes remain intact and there are almost no dark particles left behind. The ratio of trichomes to fine plant matter will determine how well the hash melts, as well as the level of separation achieved by each micron screen size. Each filter window produces a different texture, scent and melting behaviour — therefore, even products from the same grower with the same name can vary greatly in quality between batches.Comparing water hash to other concentrate types:
| Concentrate type | Is it solventless? | Characteristics consumers prefer about product | Possible downsides of product |
| Water hash | Yes | Classic hash flavour | Can easily contain plant matter during the extraction process |
| Dry Sift (kief) | Yes | Old-school/simple | Includes more plant matter than desired |
| Rosin (pressed) | Yes | Better flavour/cleaner dabs without solvent use | Must have pure source material to perform at its best |
| Hydrocarbon/ethanol Extracts | No | Potent/pure | Requires commercial equipment and safety measures |
Caring for/storing your water hash products:
- Store water hash in an airtight container in a cool, dark location.
- Some manufacturers store their products in vacuum-sealed bags and freeze them.
- After use, wash your Bubble Bags thoroughly with cold water and a small amount of soap. Do not use hot water, as it will damage the mesh screens.
- Keep your bags stored clean and dry to help avoid mildew growth.
Quick Q&A
- Are water hash and bubble hash the same? Yes — they are often referred to as the same thing, with ‘bubble hash’ being a common name for water hash.
- Does solventless mean healthier? No — not always. Solventless simply means no chemical solvents were used. Cleanliness and processing methods still matter.
- Why do people press their water hash into rosin? Because rosin can taste cleaner and be more user-friendly for dabbing, as it removes excess wax and plant material from the hash.
- How should I store my hash? In an airtight container, somewhere cool and dark. Temperature and oxygen destroy flavour fastest.
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Are there other ways to make cannabis hash? Yes. Bubble hash is just one method. Hash can also be produced using other techniques, each with its own process and characteristics. To learn more, read our guide: How to Create Cannabis Hash: Understanding the Process.
🌿 Ready to Make Your First Batch of Solventless Hash?
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